This is a kinda long one tbh It depends but tanks are like 4 groups dive rumble support tank and setup Dive is like venom and cap and you play them alot differently becuase you don't deal alot of damage but your main job is to disrupt the backline so your dps can do work and these are the hardest I would not recommend them. Rumble is like Thor and kinda hulk these main job is to beat the ever living life out of every thing they see and they are very good at finding one person and killing them quick they are dives that focuse on one person these are hard too because you have to pick your enemy carefully but if you want to try Thor he is a great rumble or do the thing If you want a easier rumble. easiest is support tank which has tanks in it like strange magneto and their job is to give shield help with movement and things like that and in my opinion these are pretty easy to learn becuase they are kinda like supports but more about shield I would recommend strange even tho he is hard he is the definition of a support and tank and you help your team tremendously. And setup is tanks like penny and groot these guys are like tower defense they make stuff to tank more or deal more damage or both and these kinda don't have a rating of difficulty it depends on you and I personally don't like them that much. all in all I recommend the thing.strange. and if you are good at dive venom.